HVAC Take-Off Engineer Needed

I need a professional plans take-off engineer, this engineer will do the take off for the HVAC section (air conditioning only). All I need is an itemized list of all parts needed within the projects (such as a/c system, duct work, duct size, copper lines, PVC lines and so on) for a residential/commercial building with a square footage of 2000 to 50,000 sq ft. The engineer should not have any specific brand bias as I am open to all brands. Prior experience with HVAC take-offs is highly desired, particularly for residential and commercial buildings. The ideal freelancer would be able to provide a detailed and accurate list of all necessary components for the project.